Permanent Magnetism in Thiol Capped Nanoparticles, Gold and ZnO |
| P. Crespo, M.A. García, E. Fernández-Pinel, J. de la Venta, J.M. Merino, A. Quesada, A. Hernando
Instituto de Magnetismo Aplicado (UCM-CSIC), P.O. Box 155, 28230 Las Rozas, Madrid, Spain, and Dpto. Física de Materiales, UCM, 28040 Madrid, Spain A. Fernández Instituto de Ciencia de Materiales de Sevilla CSIC-UNSE, Américo Vespucio s/n, 41092 Sevilla, Spain, and Departamento de Quimica Inorgánica, Universidad de Sevilla, Spain and S. Penadés Grupo Carbohidratos, Laboratory of Glyconanotechnology IIQ-CSIC, Américo Vespucio s/n, 41092 Sevilla, Spain |
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| Received: 9 07 2007; |
| In spite of the diamagnetic behavior exhibited by bulk ZnO and Au, a ferromagnetic-like behavior is induced in nanoparticles of both systems by appropriate surface functionalization. By capping with thiol derivatized molecules, magnetic hysteresis is observed even at room temperature, whereas the magnetization has a very little temperature dependence. Capping induces an alteration of their electronic configuration that depends on the capping molecule, as evidenced by X-ray absorption spectroscopy, that strongly affects their magnetic properties. |
| DOI: 10.12693/APhysPolA.113.515 PACS numbers: 75.75.+a, 73.22.-f, 75.30.Hx |